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    Question

    The average of 18 numbers is 40, and the average of the

    first 9 numbers is 45. Find the average of the remaining 9 numbers.
    A 35 Correct Answer Incorrect Answer
    B 33 Correct Answer Incorrect Answer
    C 30 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Sum of 18 numbers = 18 ร— 40 = 720 Sum of first 9 numbers = 9 ร— 45 = 405 Now, sum of last 9 numbers = (720 โ€“ 405) = 315 Therefore, average of last 9 numbers = 315/9 = 35

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